I think they maybe will make an 88 key Arranger someday but I doubt if it will be "weighted". See Squeak_D's post on "Weighted Keys on a PSR" to see why. Even Semi-weighted would probably be out of the question for the same reasons. But I think more real-time control, better key "feel", and obviously better sounds would spark a greater public interest in Arrangers IMO and would give the musician greater creativity.

Sounds are what its all about and to have the ability to play those sounds in a creative real-time fashion without encumbrance would be a boon to the Arranger market and also if Manufacturers would take more labors in producing better quality sounds, get rid of the limiting factors of not enough Polyphony (Note drop off in the middle of a performance is a bummer), and add more necessary features, ie., USB 2.0/Firewire, Spdif Output, superb quality "built-in" speakers, and yes, an 88 key version would be nice too ,etc., would all be a step in the right direction IMHO. Hopefully are friends at Yamaha and others are working towards that goal.

Mike